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[PATCH] hwmon: hwmon vs i2c, second round (02/11)
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The way i2c-sensor handles forced addresses could be optimized. It
defines a structure (i2c_force_data) to associate a module parameter
with a given kind value, but in fact this kind value is always the
index of the structure in each array it is used in. So this additional
value can be omitted, and still be deduced in the code handling these
arrays.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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Jean Delvare authored and Greg Kroah-Hartman committed Sep 5, 2005
1 parent 9fc6adf commit ef8dec5
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Showing 2 changed files with 67 additions and 79 deletions.
13 changes: 6 additions & 7 deletions drivers/i2c/i2c-sensor-detect.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -32,7 +32,6 @@ int i2c_detect(struct i2c_adapter *adapter,
int (*found_proc) (struct i2c_adapter *, int, int))
{
int addr, i, found, j, err;
struct i2c_force_data *this_force;
int adapter_id = i2c_adapter_id(adapter);
unsigned short *normal_i2c;
unsigned short *probe;
Expand All @@ -58,13 +57,13 @@ int i2c_detect(struct i2c_adapter *adapter,
/* If it is in one of the force entries, we don't do any
detection at all */
found = 0;
for (i = 0; !found && (this_force = address_data->forces + i, this_force->force); i++) {
for (j = 0; !found && (this_force->force[j] != I2C_CLIENT_END); j += 2) {
if ( ((adapter_id == this_force->force[j]) ||
(this_force->force[j] == ANY_I2C_BUS)) &&
(addr == this_force->force[j + 1]) ) {
for (i = 0; address_data->forces[i]; i++) {
for (j = 0; !found && (address_data->forces[i][j] != I2C_CLIENT_END); j += 2) {
if ( ((adapter_id == address_data->forces[i][j]) ||
(address_data->forces[i][j] == ANY_I2C_BUS)) &&
(addr == address_data->forces[i][j + 1]) ) {
dev_dbg(&adapter->dev, "found force parameter for adapter %d, addr %04x\n", adapter_id, addr);
if ((err = found_proc(adapter, addr, this_force->kind)))
if ((err = found_proc(adapter, addr, i)))
return err;
found = 1;
}
Expand Down
133 changes: 61 additions & 72 deletions include/linux/i2c-sensor.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -22,22 +22,6 @@
#ifndef _LINUX_I2C_SENSOR_H
#define _LINUX_I2C_SENSOR_H

/* A structure containing detect information.
Force variables overrule all other variables; they force a detection on
that place. If a specific chip is given, the module blindly assumes this
chip type is present; if a general force (kind == 0) is given, the module
will still try to figure out what type of chip is present. This is useful
if for some reasons the detect for SMBus address space filled fails.
probe: insmod parameter. Initialize this list with I2C_CLIENT_END values.
A list of pairs. The first value is a bus number (ANY_I2C_BUS for any
I2C bus), the second is the address.
kind: The kind of chip. 0 equals any chip.
*/
struct i2c_force_data {
unsigned short *force;
unsigned short kind;
};

/* A structure containing the detect information.
normal_i2c: filled in by the module writer. Terminated by I2C_CLIENT_END.
A list of I2C addresses which should normally be examined.
Expand All @@ -50,14 +34,18 @@ struct i2c_force_data {
I2C bus), the second is the I2C address. These addresses are never
probed. This parameter overrules 'normal' and probe', but not the
'force' lists.
force_data: insmod parameters. A list, ending with an element of which
the force field is NULL.
forces: insmod parameters. A list, ending with a NULL element.
Force variables overrule all other variables; they force a detection on
that place. If a specific chip is given, the module blindly assumes this
chip type is present; if a general force (kind == 0) is given, the module
will still try to figure out what type of chip is present. This is useful
if for some reasons the detect for SMBus address space filled fails.
*/
struct i2c_address_data {
unsigned short *normal_i2c;
unsigned short *probe;
unsigned short *ignore;
struct i2c_force_data *forces;
unsigned short **forces;
};

#define SENSORS_MODULE_PARM_FORCE(name) \
Expand Down Expand Up @@ -88,7 +76,8 @@ struct i2c_address_data {
I2C_CLIENT_MODULE_PARM(force, \
"List of adapter,address pairs to boldly assume " \
"to be present"); \
static struct i2c_force_data forces[] = {{force,any_chip},{NULL}}; \
static unsigned short *forces[] = { force, \
NULL }; \
SENSORS_INSMOD

#define SENSORS_INSMOD_1(chip1) \
Expand All @@ -97,9 +86,9 @@ struct i2c_address_data {
"List of adapter,address pairs to boldly assume " \
"to be present"); \
SENSORS_MODULE_PARM_FORCE(chip1); \
static struct i2c_force_data forces[] = {{force,any_chip},\
{force_ ## chip1,chip1}, \
{NULL}}; \
static unsigned short *forces[] = { force, \
force_##chip1, \
NULL }; \
SENSORS_INSMOD

#define SENSORS_INSMOD_2(chip1,chip2) \
Expand All @@ -109,10 +98,10 @@ struct i2c_address_data {
"to be present"); \
SENSORS_MODULE_PARM_FORCE(chip1); \
SENSORS_MODULE_PARM_FORCE(chip2); \
static struct i2c_force_data forces[] = {{force,any_chip}, \
{force_ ## chip1,chip1}, \
{force_ ## chip2,chip2}, \
{NULL}}; \
static unsigned short *forces[] = { force, \
force_##chip1, \
force_##chip2, \
NULL }; \
SENSORS_INSMOD

#define SENSORS_INSMOD_3(chip1,chip2,chip3) \
Expand All @@ -123,11 +112,11 @@ struct i2c_address_data {
SENSORS_MODULE_PARM_FORCE(chip1); \
SENSORS_MODULE_PARM_FORCE(chip2); \
SENSORS_MODULE_PARM_FORCE(chip3); \
static struct i2c_force_data forces[] = {{force,any_chip}, \
{force_ ## chip1,chip1}, \
{force_ ## chip2,chip2}, \
{force_ ## chip3,chip3}, \
{NULL}}; \
static unsigned short *forces[] = { force, \
force_##chip1, \
force_##chip2, \
force_##chip3, \
NULL }; \
SENSORS_INSMOD

#define SENSORS_INSMOD_4(chip1,chip2,chip3,chip4) \
Expand All @@ -139,12 +128,12 @@ struct i2c_address_data {
SENSORS_MODULE_PARM_FORCE(chip2); \
SENSORS_MODULE_PARM_FORCE(chip3); \
SENSORS_MODULE_PARM_FORCE(chip4); \
static struct i2c_force_data forces[] = {{force,any_chip}, \
{force_ ## chip1,chip1}, \
{force_ ## chip2,chip2}, \
{force_ ## chip3,chip3}, \
{force_ ## chip4,chip4}, \
{NULL}}; \
static unsigned short *forces[] = { force, \
force_##chip1, \
force_##chip2, \
force_##chip3, \
force_##chip4, \
NULL}; \
SENSORS_INSMOD

#define SENSORS_INSMOD_5(chip1,chip2,chip3,chip4,chip5) \
Expand All @@ -157,13 +146,13 @@ struct i2c_address_data {
SENSORS_MODULE_PARM_FORCE(chip3); \
SENSORS_MODULE_PARM_FORCE(chip4); \
SENSORS_MODULE_PARM_FORCE(chip5); \
static struct i2c_force_data forces[] = {{force,any_chip}, \
{force_ ## chip1,chip1}, \
{force_ ## chip2,chip2}, \
{force_ ## chip3,chip3}, \
{force_ ## chip4,chip4}, \
{force_ ## chip5,chip5}, \
{NULL}}; \
static unsigned short *forces[] = { force, \
force_##chip1, \
force_##chip2, \
force_##chip3, \
force_##chip4, \
force_##chip5, \
NULL }; \
SENSORS_INSMOD

#define SENSORS_INSMOD_6(chip1,chip2,chip3,chip4,chip5,chip6) \
Expand All @@ -177,14 +166,14 @@ struct i2c_address_data {
SENSORS_MODULE_PARM_FORCE(chip4); \
SENSORS_MODULE_PARM_FORCE(chip5); \
SENSORS_MODULE_PARM_FORCE(chip6); \
static struct i2c_force_data forces[] = {{force,any_chip}, \
{force_ ## chip1,chip1}, \
{force_ ## chip2,chip2}, \
{force_ ## chip3,chip3}, \
{force_ ## chip4,chip4}, \
{force_ ## chip5,chip5}, \
{force_ ## chip6,chip6}, \
{NULL}}; \
static unsigned short *forces[] = { force, \
force_##chip1, \
force_##chip2, \
force_##chip3, \
force_##chip4, \
force_##chip5, \
force_##chip6, \
NULL }; \
SENSORS_INSMOD

#define SENSORS_INSMOD_7(chip1,chip2,chip3,chip4,chip5,chip6,chip7) \
Expand All @@ -199,15 +188,15 @@ struct i2c_address_data {
SENSORS_MODULE_PARM_FORCE(chip5); \
SENSORS_MODULE_PARM_FORCE(chip6); \
SENSORS_MODULE_PARM_FORCE(chip7); \
static struct i2c_force_data forces[] = {{force,any_chip}, \
{force_ ## chip1,chip1}, \
{force_ ## chip2,chip2}, \
{force_ ## chip3,chip3}, \
{force_ ## chip4,chip4}, \
{force_ ## chip5,chip5}, \
{force_ ## chip6,chip6}, \
{force_ ## chip7,chip7}, \
{NULL}}; \
static unsigned short *forces[] = { force, \
force_##chip1, \
force_##chip2, \
force_##chip3, \
force_##chip4, \
force_##chip5, \
force_##chip6, \
force_##chip7, \
NULL }; \
SENSORS_INSMOD

#define SENSORS_INSMOD_8(chip1,chip2,chip3,chip4,chip5,chip6,chip7,chip8) \
Expand All @@ -223,16 +212,16 @@ struct i2c_address_data {
SENSORS_MODULE_PARM_FORCE(chip6); \
SENSORS_MODULE_PARM_FORCE(chip7); \
SENSORS_MODULE_PARM_FORCE(chip8); \
static struct i2c_force_data forces[] = {{force,any_chip}, \
{force_ ## chip1,chip1}, \
{force_ ## chip2,chip2}, \
{force_ ## chip3,chip3}, \
{force_ ## chip4,chip4}, \
{force_ ## chip5,chip5}, \
{force_ ## chip6,chip6}, \
{force_ ## chip7,chip7}, \
{force_ ## chip8,chip8}, \
{NULL}}; \
static unsigned short *forces[] = { force, \
force_##chip1, \
force_##chip2, \
force_##chip3, \
force_##chip4, \
force_##chip5, \
force_##chip6, \
force_##chip7, \
force_##chip8, \
NULL }; \
SENSORS_INSMOD

/* Detect function. It iterates over all possible addresses itself. For
Expand Down

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